US3816582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of cylinders
Assignee: Individual
•
Filing: 1972-10-24
•
Granted: 1974-06-11
•
Expires: 1992-10-24
Abstract
Abstract IN THE NANUFACTURE OF CYLINDERS COMPRISING TWO CONCENTRIC CYLINDRICAL SHELLS WITH AN INTERPOSED CORE COMPRISING RADIALLY EXTENDING GAS-FILLED CELLS A THIN SUPPORT LAYER WHICH IS POROUS TO THE MATERIAL FROM WHICH THE INNER SHELL IS SPUN CAST IS APPLIED TO THE INNER FACE O THE CORE AND THE INNER SHELL IS SPUN CAST AGAINST THE SUPPORT LAYER.
Inventors
- 👤 R Tennyson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:10
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/34; B29C41/46; B29C41/02; B29C41/025; B29C41/04; B29C41/042; B29D; B29D24/00; B29D24/002; B29D24/005; B29K; B29K2105/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |